Correctly speaking, it should not be too early to calculate by one year old, because there is a slight difference in the age at which children begin to receive education, and some children may lose one or two years in kindergarten. At the same time, it does not rule out that they have higher IQ, but according to the current situation, they should not be allowed to skip classes, but it is understandable to say that they have higher IQ, and there are also pre-admission students now.

This is my personal opinion, I hope I can help you.